* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.item {
    width: 230px;
    height: 140px;
    outline: 1px solid;
    margin: 30px auto;
    position: relative;
}

.item img {
    width: 230px;
    height: 140px;
}


.aside {
    position: absolute;
    background-color: rgba(0, 0, 0, .5);
    width: 100%;
    height: 20px;
    bottom: 0;
    left: 0;
    color: #fff;
    font-size: 12px;
    /* line-height的值和父元素高度一样，文本会在容器中垂直居中。 */
    line-height: 20px;
    padding: 0 10px;
}




.number::before {
    content: "";
    width: 16px;
    height: 16px;
    background: url('../assets/icons.png') no-repeat -255px -63px;
    display: inline-block;
    /* 行块盒元素想要和文字对其 */
    vertical-align: -5px;
}

.left {
    float: left;
}

.right {
    float: right;
}

.modal {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background: rgba(0, 0, 0, .5);
}

.modal .play {
    position: absolute;
    width: 44px;
    height: 44px;
    background: url(../assets/icons.png) no-repeat -190px -62px;
    left: 50%;
    top: 50%;
    margin-top: -22px;
    margin-left: -22px;
    /* outline: 1px solid red; */
}